Automatic belt tightener



Dec. 8, 1931. w. c. STEWART AUTOMATIC BELT TIGHTENER Filed July 24, 1928Patented Dec. 8, 1931 WALTER cfs'rnwaa'n on eas'roma jnon'rnrdenotingAssIGNon; BY mm ASSIGN- --MENTS, TOgEMANU-EL rnomvmngomeas'romegnomnees-nouns i i wav e f ii li j I i I types when mounted on wheels whichare aflixed to shafts with said shafts moving Vertically withrelationtoeaeh other.

My invention relates to a belt tighter for roving frames and has meansforpreserving the tautness of the chain belt running on wheels mountedon the roving frame differential sleeve and the gearing for driving thebobbin shafts.

It is well known that the bobbin shafts and i the housing movevertically with relation to the roving frame differential and as aresult of said movement the chain belt running between the roving framedifferential and the bobbin shaft gearing becomes very loose when thetwo shafts are in the same horizontal plane, but when the bobbin shaftand bobbin shaft gearing move to a point below the horizontal plane ofthe roving frame differential then the belt becomes more taut and it isan object of this invention to provide automatic means for taking up theslackin the belt as 1 2.1- the same occurs from time to time.

. the description proceeds when taken in con- 1 neetion with theaccompanying drawings, in

Some of the objects'of my invention having been stated,- other objectswill appear as Figure 1' is an end elevation of the roving framedifferential. shaft and the bobbin shaft gear housing witha belt runningthere be tween and showing my invention applied;

Figure 2 is a similar view, but showing the position of parts'when thebobbin shaft gear 7 shaft gear housing of a roving frame carrying thebobbinshafts which are driven'by the gear wheel '11 on the shaft 12 and,as is well. known in the art, this bobbin shaft gear Y housing movesVertically with relation to the roving frame differential during theoperation of the machine. The roving frame differential sleeve 13 hasmounted thereonthe wheel 14, which sleeve bearing the Wheel 14 plan viewof the two precedis rmaabiylmeuntd a. s the shaft 15;] the *wheel "-14and the shaft 13 being secured to eaelr'other for. unitary movement. v

Mounted onthe maindrive shaft 15-is the member:16whieh has theshortcrank' l'fand i the long crank; -18"'inte'gral therewith-{and inthe end of the lon'gcrank 18;is i'nounted 'the tightening pulley '19-fonthe pin 20, 'whichpujl- "le y is adapted to'-- engage the lower side ofthe chain belt 2110' take' up' 'the slack as it (occurs. The'end-of"theshort crank 17 is forked and I loosely" secured therein is the'-member 22 which-is rotatably'se'cured on the pin 23,;and slidablymo'unted in the member22- isthe rod 24 w'hichhas the portion 25engagi'ng'the bobbin shaft gearhousing" 10, and adjust-ably 'fniountedon thisrod24 by means of the set screw 27 is tl1eabut1nent26 a ainst'which} the coiled spring 28 rests, the

v L eiid of the coiled against the member 5 22- in the "end "of the-a'-rin17. -It is thus; seen that therod' 24 is slidably 'I e nin'gwillbei n cessar afnd as a result the arm shown; but when 'theibobbiiishaftgear h'o'us the slackened'portion 'of the belt upwardly filing 4 I'It'ifs intended that thismechanism isito be applied onchainfbe'ltsandthe belt 2 1Jis presumed to a chain belt and 'tlielwheels "11 "and 14are presumed toibe gear wheels,

- and'prev'ent-the same from dangling and ratalthough thism'ech'anismmay be applied to u ordinary pulleysand ordinary belts.

:In" the drawings and specification I have set forth apreferredembodiment of my in- 'vention';and although specific terms areemseriptive sense only and not'forpurposes of limitation, thescope ofthe invention being set v'forthainthe appended claimsl" lclaini gg .A:FL M .7 '..1.;In"an"automatic adjuster for the ta'uts )rin abuttin I b Omounted with relation t'o "the 1 mankiarm l7 andwhen the partsare inthefposition shown in Figures, the belt will taut and no tight 18 willdropdownwardly into "the PQSitibn ing rises as shown in Figurefl ,ffthecoiled -spring 28 on thejrod 24' will push on "the'arm 17 and; cause thetightening pulley 19 to lift ployed, they are used in a generic and ,de-

on said rod, a tensionispring tbetween.,said ad uStable member and theone end of said mounted on the two Wheels, the other end of said bellcrank lever having slidably mounted therein a rod, the other end of saidrod being connected to said housing, a projection adjustably mounted onsaid rod, a compression; {spring=,--mounted between said projectaonaandrthe endiof saidnbellrcrank.lever, said spring being adaptedto press the idler pulley against the lower side of said belt, and toanimatew-conseaat tautness 11i the belt as thLIbdbbiniShEt-ft: moveswith relation to the .drive shaft, y

""In' testimony whereof I aflix my signature.

. WALTER o. STEWART.

a release the;pressure;onthevbeltes the bobbin shaft lowers,anditoiincrease the pressure on r a the {belies therbobbin @shaft:raises. 20 2." gIn,--,an automatic :belt :t ightenerg two rotatableshar'-ts,-=one-oiwsaid-shafts being mov- .i ,able-in-a vert-ioal plane,axwheel mounted on e I .ieachpfithe; shaftsj,; a .belt;:on :said-Wheels, a

vhousingafor one or (theashaifts; a'bell:icrank .ia-ro'dslidablyamountedinthe otherendiof the.rsaidabell-zcranki lever, ;theother endof :said .nod being mounted iimsaid housing; an 30;;adjustab-le,meinben mountedonsaid: rod, a

vcomp'ressiong :zspring amounted a between said sad justable, *membemand theend of "the: bell cranklever, througha-Wh-ich ithe -rod :passes,

vsaid mechanismbeingmdaptedto automatical- I J lyradjust-theztension oftheibelton'saidwheel.- 3.111, a device @for automatic ally maintainingtautness in a belt, a drive shaft, awheel on said 1 drive shaft,"ansecond drive shaft, a wheel on .saidlsecond shaft,--a housingi'forsaid second shaft, said secondshait-beingverticalgly.movablewhilerrotating,aibell orank lewer mountedonsaidifi-rst -gshaft,-, an idler -.pulley ,mountediin one end-of saidbell crank-lever, being; adapted ,to, p-ressa on the: outer side45;,ofra beltfmounted on thetwo whee1s,: the Mother: end iofasaid -bellcranlc-leverxhaving a zholetherethrough, a rod slidablymounted in i ,isaid .ho1 e, tlie other end, ofisaid rod beingsecured ,to the housing,-anadjustablemember mounted on said rod, a tension spring mounts ,ed ,on.said rod between said adjustable pro- :jectionandgthe end ofethebellfcrank-lever ithroughi which the rod-"slidably. proj eats, all of,said ,mechanisms being adapted toamain- 5.3 tain; a constant,tautness-in .the abelt which is mounted: on the two,-vwl eels.

A. Ineae driving; mechanism:-for-- -arroving 7 frame,: a main drieveshaft, aibobbinsh'aft, a housing ion the tbobbinnshaft, :a.'. be1l crank.levernmounted o11Jthe-.,maindrive shaft, :a wheelamounted 1 ,011 ithemainadrive shaft, za

iwheelimountedon one iof theabobbin: shafts, "a

belt on said wheelsgone-ndiofsaidi bellic'rank lever having an idlerpulley therein; adapted 69 V, to ;.-press aga nstgthe lower side iof.theabelt

